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## Index: Symbols & Numbers

& (ampersand)
  && (logical AND) operator: 7.8. Relational and Boolean Operators
  in replacement text: 5.3. Substitution
    5.3.1. Replacement Metacharacters
* (asterisk)
  ** (exponentiation) operator: 7.6. Expressions
  **= (assignment) operator: 7.6. Expressions
  *= (assignment) operator: 7.6. Expressions
  as metacharacter: 3.1. That's an Expression
    3.2.5. Repeated Occurrences of a Character
  multiplication operator: 7.6. Expressions
(backslash): 7.6. Expressions
  (see also escape sequences, awk)
  <, > escape sequences: 3.2.11. What's the Word? Part II
    11.2.3.4. Extended regular expressions
  `, ' escape sequences: 11.2.3.4. Extended regular expressions
  character classes and: 3.2.4. Character Classes
  as metacharacter: 3.2. A Line-Up of Characters
    3.2.1. The Ubiquitous Backslash
  in replacement text: 5.3. Substitution
    5.3.1. Replacement Metacharacters
{} (braces)
  in awk: 2.1. Awk, by Sed and Grep, out of Ed
    2.4.1. Running awk
    8.1. Conditional Statements
  {} metacharacters: 3.2. A Line-Up of Characters
    3.2.8. A Span of Characters
  grouping sed commands in: 4.2.1. Grouping Commands
    5.1. About the Syntax of sed Commands
[] (brackets) metacharacters: 3.2. A Line-Up of Characters
  3.2.4. Character Classes
[::] metacharacters: 3.2.4.3. POSIX character class additions
[..] metacharacters: 3.2.4.3. POSIX character class additions
[==] metacharacters: 3.2.4.3. POSIX character class additions
^ (circumflex)
  character classes and: 3.2. A Line-Up of Characters
    3.2.4.2. Excluding a class of characters
  ^= (assignment) operator: 7.6. Expressions
  exponentiation operator: 7.6. Expressions
  as metacharacter: 3.2. A Line-Up of Characters
    3.2.7. Positional Metacharacters
  in multiline pattern space: 6.1.1. Append Next Line
: (colon) for labels: 6.4. Advanced Flow Control Commands
$ (dollar sign)
  as end-of-line metacharacter: 3.2. A Line-Up of Characters
    3.2.7. Positional Metacharacters
  for last input line: 4.2. A Global Perspective on Addressing
  in multiline pattern space: 6.1.1. Append Next Line
. (dot) metacharacter: 3.1. That's an Expression
  3.2.2. A Wildcard
  3.2.5. Repeated Occurrences of a Character
= (equal sign)
  == (equal to) operator: 7.8. Relational and Boolean Operators
  for printing line numbers: 5.9. Print Line Number
! (exclamation point): 4.2. A Global Perspective on Addressing
  A.2.1. Pattern Addressing
  branch command versus: 6.4.1. Branching
  csh and: 1.4. Four Hurdles to Mastering sed and awk
  != (not equal to) operator: 7.8. Relational and Boolean Operators
  !~ (does not match) operator: 7.5.1. Referencing and Separating Fields
    7.8. Relational and Boolean Operators
    7.8. Relational and Boolean Operators
  logical NOT operator: 7.8. Relational and Boolean Operators
> (greater than sign)
  >= (greater than or equal to) operator: 7.8. Relational and Boolean Operators
  for redirection: 2.3.2.1. Saving output
    4.3. Testing and Saving Output
    10.5. Directing Output to Files and Pipes
  relational operator: 7.8. Relational and Boolean Operators
- (hyphen)
  character classes and: 3.2.4.1. A range of characters
  -= (assignment) operator: 7.6. Expressions
  -- (decrement) operator: 7.6. Expressions
    7.6. Expressions
  subtraction operator: 7.6. Expressions
< (less than sign)
  <= (less than or equal to) operator: 7.8. Relational and Boolean Operators
  relational operator: 7.8. Relational and Boolean Operators
# for comments: 5.2. Comment
  7.4.1. Describing Your Script
  B.2.2.2. Comments
  #n for suppressing output: 5.2. Comment
#!, invoking awk with: 10.9. Invoking awk Using the #! Syntax
  B.1.1. Shell Wrapper for Invoking awk
( ) (parentheses): 2.2.1. Scripting
  3.2. A Line-Up of Characters
  3.2.10. Grouping Operations
  with replacing text: 5.3.1. Replacement Metacharacters
% (percent sign)
  for format specifications: 7.9. Formatted Printing
  modulo operator: 7.6. Expressions
  %= (assignment) operator: 7.6. Expressions
+ (plus)
  addition operator: 7.6. Expressions
  metacharacter: 7.4. Pattern Matching
  += (assignment) operator: 7.6. Expressions
  ++ (increment) operator: 7.6. Expressions
    7.6. Expressions
? (question mark)
  as metacharacter: 3.2. A Line-Up of Characters
    3.2.5. Repeated Occurrences of a Character
  ?: (conditional) operator: 8.1.1. Conditional Operator
    11.1.3. The C Conditional Expression
; (semicolon): 2.3.1. Specifying Simple Instructions
  2.4.1. Running awk
  B.2.2.1. Line termination
(single quotes): 2.2. Command-Line Syntax
  2.3.1. Specifying Simple Instructions
/ (slash)
  division operator: 7.6. Expressions
  in ed commands: 2.1. Awk, by Sed and Grep, out of Ed
  pattern addressing: 2.1. Awk, by Sed and Grep, out of Ed
    A.2.1. Pattern Addressing
  /= (assignment) operator: 7.6. Expressions
  // as delimiter: 2.1. Awk, by Sed and Grep, out of Ed
    5.3. Substitution
~ (match) operator: 7.5.1. Referencing and Separating Fields
  7.8. Relational and Boolean Operators
  7.8. Relational and Boolean Operators
| (vertical bar)
  as metacharacter: 3.2. A Line-Up of Characters
    3.2.9. Alternative Operations
  piping output with: 10.5.1. Directing Output to a Pipe
  || (logical OR) operator: 7.8. Relational and Boolean Operators

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